LM Guide THK - Industrial Technologies

Индастриал Технолоджис www.industrial‐technologies.com.ua +38 044 498 21 94Accuracy Averaging Effect by Absorbing Mounting Surface ErrorThe LM Guide contains highly spherical balls and has a constrained structure with no clearance. Inaddition, it uses LM rails in parallel on multiple axes to form a guide system with multiple-axis configuration.Thus, the LM Guide is capable of absorbing misalignment in straightness, flatness or parallelismthat would occur in the machining of the base to which the LM Guide is to be mounted or in theinstallation of the LM Guide by averaging these errors.The magnitude of the averaging effect varies according to the length or size of the misalignment, thepreload applied on the LM Guide and the number of axes in the multiple-axis configuration. Whenmisalignment is given to one of the LM rails of the table as shown in Fig.8, the magnitude of misalignmentand the actual dynamic accuracy of the table (straightness in the horizontal direction) are asshown in Fig.9.By applying such characteristics obtained with the averaging effect, you can easily establish a guidesystem with high precision of motion.Straightness accuracy (mm) Misalignment (mm)0.020.0100.010.020.0020.00100.0010.002265200SHS30Single-axis actuatorRail 20 100 200 300 400 500 600 700Rail length (mm)Misalignment curve (vertical)Stroke (mm)Displacement of the table (vertical)Straight-edge Electric micrometer Table200310685Fig.80.01Rail 1 Rail 10.368μm0 50 100 150 200 250Fig.9Straightness accuracy (mm) Misalignment (mm)0.020.0100.020.0020.00100.001Rail 2293303Base0 100 200 300 400 500 600 700Rail length (mm)Misalignment curve (horizontal)0.601μm0 50 100 150 200 2500.002Stroke (mm)Displacement of the table (horizontal)Industrial TechnologiesA1-10